JP2013181054A - Pressure-sensitive adhesive product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure-sensitive adhesive product having two or more dot-like pressure-sensitive adhesive agents on a base material, and excellent in repeelability.SOLUTION: A pressure-sensitive adhesive product has two or more dot-like pressure-sensitive adhesive agents on a base material, and the areal ratio prescribed by the following is 10 to 60%. The areal ratio (%) is a proportion of areas the dot-like pressure-sensitive adhesive agents accounts for of a unit area of the base material. In the pressure-sensitive adhesive product, the interval between adjacent dot-like pressure-sensitive adhesive agents is preferably ≥0.5 mm and <4.0 mm. A fixing method of parts is provided, the method fixing a second part on a first part after the dot-like pressure-sensitive adhesive agents in the pressure-sensitive adhesive product are transferred to the first part.

Description

  The present invention relates to an adhesive product. Specifically, the present invention relates to an adhesive product having excellent removability.

  Conventionally, adhesive products have been used in various fields. With adhesive products, air is trapped between the adhesive part and the adherend when affixed to the adherend, and the adhesive product floats or peels off due to air bubbles, causing wrinkles. There was a problem with stickiness. In order to solve such a problem, an adhesive product having a so-called dot pattern adhesive surface having two or more point-like adhesives on a substrate has been proposed.

  For example, as an adhesive product having the adhesive surface of the dot pattern, the dot diameter of the adhesive is less than 1.5 mm, the thickness of the adhesive layer is less than 25 μm, the area ratio is set to 0.7 or more, and necessary There is known an adhesive product in which sufficient adhesive strength is ensured (see Patent Document 1).

JP 2010-174148 A

  The adhesive product has a strong adhesive force and cannot be easily peeled off from the adherend after being attached to the adherend, and may cause damage to the adherend when peeled off from the adherend. It is difficult to use in applications that require removability.

  Accordingly, an object of the present invention is to provide a pressure-sensitive adhesive product having two or more point-like pressure-sensitive adhesives on a substrate and excellent in removability.

  As a result of intensive studies to achieve the above object, the present inventors have found that when the area ratio of the pressure-sensitive adhesive product having two or more point-like pressure-sensitive adhesives is within a predetermined range, good removability is achieved. It was found that it can be obtained. The present invention has been completed through further studies based on these findings.

That is, this invention provides the adhesive product characterized by having 2 or more point-like adhesive on a base material, and the area ratio prescribed | regulated below being 10 to 60%.
Area ratio (%): Ratio of the area occupied by the point-like adhesive in the unit area of the substrate

  It is preferable that the space | interval between adjacent point-like adhesives of the said adhesive product is 0.5 mm or more and less than 4.0 mm.

  Furthermore, this invention provides the fixing method of the components characterized by fixing said 1st components to 2nd components, after transferring the point-like adhesive in the said adhesive product to 1st components.

  According to the pressure-sensitive adhesive product of the present invention, it has two or more point-like pressure-sensitive adhesives on the substrate, and the area ratio is within a predetermined range, so that it has excellent removability.

FIG. 1 is a schematic top view showing an example of the pressure-sensitive adhesive product of the present invention. FIG. 2 is a schematic cross-sectional view showing a cross section taken along line II-II ′ of the adhesive product of FIG. 1. FIG. 3 is an enlarged top view of the adhesive product of FIG. FIG. 4 is an explanatory diagram (perspective view) showing the positional relationship between a polycarbonate plate, a test piece, and a weight in a constant load peel test. FIG. 5 is an explanatory view (side view) showing the positional relationship between the polycarbonate plate, the test piece, and the weight in the constant load peel test. FIG. 6 is a schematic view (cross-sectional view) showing an example of a fixing method using the pressure-sensitive adhesive product of the present invention.

  The pressure-sensitive adhesive product of the present invention has two or more point-like pressure-sensitive adhesives on the base material, and the area ratio (area ratio (%): the ratio of the area occupied by the point-like pressure-sensitive adhesive in the unit area of the base material) is 10. It is an adhesive product that is ~ 60%. The pressure-sensitive adhesive product of the present invention is produced by forming two or more point-like pressure-sensitive adhesives on a substrate with a pressure-sensitive adhesive composition. The pressure-sensitive adhesive product of the present invention can transfer the point-like pressure-sensitive adhesive to the adherend by applying it to the adherend. In the present specification, the area ratio may be simply referred to as “area ratio”. In this specification, the pressure-sensitive adhesive product is a product having a pressure-sensitive adhesive part (pressure-sensitive adhesive part) provided by a pressure-sensitive adhesive (pressure-sensitive adhesive), and is not particularly limited. For example, a pressure-sensitive adhesive tape, a pressure-sensitive adhesive sheet, A pressure-sensitive adhesive film, a pressure-sensitive adhesive label, a laminate thereof, or a wound body thereof is included.

  The pressure-sensitive adhesive product of the present invention may be a pressure-sensitive adhesive product (single separator type) having two or more point-like pressure-sensitive adhesives on one base material, or two or more point-like pressure-sensitive adhesives between two base materials. It may be a pressure-sensitive adhesive product (double separator type). That is, in the pressure-sensitive adhesive product of the present invention, the surface (pressure-sensitive adhesive surface) provided by the point-like pressure-sensitive adhesive may be protected by a separate substrate, or may be wound in a roll shape to form a single substrate. It may be protected by a material. For example, the adhesive products shown in FIGS. 1, 2 and 3 are of a double separator type. In FIG. 1 and FIG. 3, the description of the base material 11a is omitted.

  The point-like pressure-sensitive adhesive (point-like pressure-sensitive adhesive, dot-like pressure-sensitive adhesive, dot-like pressure-sensitive adhesive) may be regularly present on the substrate or irregularly present. Good. In the pressure-sensitive adhesive product of the present invention, the point-like pressure-sensitive adhesive is preferably regularly present on the substrate from the viewpoint of stably obtaining properties such as removability and adhesiveness. In addition, as a specific example of the pressure-sensitive adhesive product in which the point-like pressure-sensitive adhesive regularly exists on the substrate, for example, the pressure-sensitive adhesive products shown in FIGS.

  The area ratio of the pressure-sensitive adhesive product of the present invention is 10 to 60%, preferably 12 to 57%, more preferably 15 to 55%. Since the pressure-sensitive adhesive product of the present invention has an area ratio of 10% or more, a sufficient adhesive force to the adherend can be obtained. Moreover, since the said area ratio is 60% or less, the adhesive product of this invention is excellent in removability. In the present specification, removability is a property that allows the adhesive product to be easily removed by hand from the adherend when the adhesive product attached to the adherend is peeled off. After attaching the part to which the adhesive has been transferred (part with a point-like adhesive) to an adherend (for example, a housing or other parts), the part with the point-like adhesive is easily peeled off from the adherend by hand. A property that can be used.

The area ratio is defined as follows.
Area ratio (%): Ratio of the area occupied by the point-like adhesive in the unit area of the substrate

  In the pressure-sensitive adhesive product, the area ratio, the interval between the following point-like pressure-sensitive adhesives, the shape of the following point-like pressure-sensitive adhesive, the size of the following point-like pressure-sensitive adhesive, etc. -1000 "(manufactured by Keyence Co., Ltd.), the point-like adhesive on the substrate of the adhesive product is observed, measured, and calculated by area calculation with the attached software.

  Although the space | interval between the point-like adhesives in the adhesive product of this invention is not specifically limited, It may differ for every space | interval and may be the same. The distance between the above point-like pressure-sensitive adhesives is preferably the same from the viewpoint of stably obtaining properties such as removability and adhesiveness. That is, in the pressure-sensitive adhesive product of the present invention, it is preferable that the point-like pressure-sensitive adhesive is present on the substrate at substantially equal intervals from the viewpoint of stably obtaining properties such as removability and adhesiveness.

  In the pressure-sensitive adhesive product of the present invention, the interval (distance) between adjacent point-like pressure-sensitive adhesives is not particularly limited, but is preferably 0.5 mm or more and less than 4.0 mm, more preferably 0.7 mm or more and less than 3.7 mm, Preferably they are 1.0 mm or more and less than 3.5 mm, Most preferably, they are 1.0 mm or more and less than 3.0 mm. It is preferable that the distance between the adjacent point-like pressure-sensitive adhesives is 0.5 mm or more, since the point-like pressure-sensitive adhesives do not stick to each other at the time of transfer, resulting in good adhesiveness. On the other hand, when the distance between the adjacent point-like pressure-sensitive adhesives is 4.0 mm or less, it is preferable because sufficient adhesion to the adherend can be easily obtained. Among these, in particular, when the interval between adjacent point-like pressure-sensitive adhesives is 1.0 mm or more and less than 3.0 mm, the adherend can be more stably fixed, and in particular, re-peelable. Therefore, it can be preferably used for applications in which stable fixing is strongly required.

  In addition, the space | interval (distance) between the said point adhesives is an interval between the center of a point adhesive and the center of a point adhesive. For example, in the pressure-sensitive adhesive product 1 in FIG. 3, the distance between the center 121 of a certain point-like pressure-sensitive adhesive 12 and the center 121 of the point-like pressure-sensitive adhesive 12 adjacent thereto is equivalent to the distance B.

  The adhesive strength of the adhesive product of the present invention is not particularly limited, but is preferably 0.1 N / 25 mm or more and less than 2.5 N / 25 mm, more preferably 0.3 N / 25 mm or more and less than 2.3 N / 25 mm, and further Preferably it is 0.4N / 25mm or more and less than 2.0N / 25mm, Most preferably, it is 0.4N / 25mm or more and less than 1.7N / 25mm. It is preferable that the adhesive strength is 0.1 N / 25 mm or more because sufficient adhesion to an adherend can be easily obtained. Moreover, when the said adhesive force is less than 2.5 N / 25mm, it becomes easy to obtain favorable removability, and it is preferable.

The said adhesive force is an adhesive force in the surface where two or more point-like adhesives exist on a base material, and is specifically calculated | required as follows. A polyethylene terephthalate film (PET film) is affixed to the “surface on which two or more point-like pressure-sensitive adhesives” of the pressure-sensitive adhesive product exists. Next, the base material is removed from the test piece, and it is pressure-bonded to a SUS plate (stainless steel plate) under conditions of a 2 kg roller and one reciprocation, and left in an environment of 23 ° C. for 30 minutes. After leaving, the test piece was peeled from the SUS plate using a tensile tester under the conditions of a peeling angle of 180 ° and a peeling speed of 300 mm / min, and the peel strength (adhesive strength) at that time was determined as the adhesive strength (N / 20 mm).
The test piece has a structure in which two or more point-like adhesives are present on one surface of the polyethylene terephthalate film. The above-mentioned test piece is transferred with the point-like adhesive of the adhesive product.

Although the peeling time by the following constant load peeling test in the adhesive product of this invention is not specifically limited, It is preferable that it is 20 minutes-90 minutes, More preferably, it is 25 minutes-75 minutes. When the peeling time is 20 minutes or more, it is possible to obtain good winding properties when forming a wound body, and it is possible to effectively suppress the occurrence of winding deviation when the wound body is in the form, which is preferable. Furthermore, sufficient adhesion to the adherend can be easily obtained, which is preferable. Further, when the peeling time is 90 minutes or less, good removability can be obtained, which is preferable.
Constant load peel test: A polyethylene terephthalate film (PET film) is attached to the “surface on which two or more point-like adhesives are present” of an adhesive product to obtain a test piece. The test piece is bonded to one side of a polycarbonate plate so that the point-like adhesive and the polycarbonate plate are in contact with each other, and pressed under the condition of one reciprocation of a 2 kg roller, and left for 16 hours. After standing for 16 hours, a 50 gf load was applied to the end of the test piece in the direction perpendicular to the surface of the polycarbonate plate, peeling of the test piece was started, and the elapsed time was measured when the test piece was peeled 100 mm in the length direction. And the peeling time.
In addition, explanatory drawing of a constant load peeling test is shown in FIG.4 and FIG.5. Moreover, a test piece has a structure where a point-like adhesive exists in one side of a polyethylene terephthalate film. The above-mentioned test piece is transferred with the point-like adhesive of the adhesive product.

(Point-like adhesive)
Although the magnitude | size of the point adhesive in the adhesive product of this invention is not specifically limited, It may differ for every point adhesive and may be the same. The size of the above point-like pressure-sensitive adhesive is preferably substantially the same from the viewpoint of stably obtaining properties such as removability and adhesiveness.

  Although the magnitude | size of the said point-like adhesive is not specifically limited, 0.3 mm-5.0 mm are preferable, More preferably, they are 0.3 mm-4.0 mm, More preferably, they are 0.5 mm-3.5 mm. When the size of the point-like pressure-sensitive adhesive is 0.3 mm or more, sufficient adhesion to the adherend can be easily obtained, which is preferable. On the other hand, when the size of the point-like pressure-sensitive adhesive is 5.0 mm or less, good removability is easily obtained, which is preferable. Moreover, it is preferable also from reducing the protrusion of glue. In this specification, the sticking out of the adhesive means that when the adhesive product is attached to the adherend and the point-like adhesive is transferred to the adherend, only a part of the shape of the adherend is transferred. This refers to a phenomenon in which a pointed adhesive sticks out of its shape.

  The magnitude | size of the said point-like adhesive is calculated | required by calculating | requiring the area of a point-like adhesive, and calculating | requiring the circle | round | yen which has the area from the area, and setting it as the diameter of the circle. In addition, in the adhesive product 1 of FIG. 3, since the dotted adhesive 12 has a circular shape, the size A of the dotted adhesive 12 corresponds to the diameter.

  The thickness (height) of the point-like pressure-sensitive adhesive is not particularly limited, but may be different or the same for each point-like pressure-sensitive adhesive. The thickness of the above point-like pressure-sensitive adhesive is preferably substantially the same from the viewpoint of stably obtaining properties such as removability and adhesiveness.

  Although the thickness of the said point-like adhesive is not specifically limited, 5-80 micrometers is preferable, More preferably, it is 10-50 micrometers. It is preferable that the thickness of the point-like pressure-sensitive adhesive is 5 μm or more because sufficient adhesion to an adherend can be easily obtained. Moreover, it is preferable also from the point of transcription | transfer of a point-like adhesive. On the other hand, when the thickness of the point-like pressure-sensitive adhesive is 80 μm or less, good removability is easily obtained, which is preferable.

  The thickness of the said point-like adhesive refers to the thickness of the largest part in the height direction in a point-like adhesive. For example, the thickness of the dotted adhesive 12 of the adhesive product 1 in FIG. 2 corresponds to the height h.

  The shape of the point-like pressure-sensitive adhesive is not particularly limited, but for example, a circular shape (for example, a perfect circle shape, an elliptical shape, a semicircular shape, a semielliptical shape, a 1/4 circular shape, a 1/4 elliptical shape, a fan shape, etc.) ), Polygonal shapes (eg, triangular, quadrilateral, pentagonal, square, rectangular, trapezoidal, rhombus, etc.), boat shape, line shape, star shape, wedge shape, arrow shape, comb shape, butterfly shape And indefinite shape. In addition, the shape of the dotted | punctate adhesive 12 of the adhesive product 1 of FIG. 1 is circular shape.

  The shape of the point-like pressure-sensitive adhesive is preferably a circular shape from the viewpoint of ease of formation of the point-like pressure-sensitive adhesive, the productivity of the pressure-sensitive adhesive product, and the point of transferability to parts.

  Although the shape of the point adhesive of the adhesive product of this invention is not specifically limited, It may differ for every point adhesive, and may be the same. It is preferable that the shape of the above-mentioned point-like pressure-sensitive adhesive is substantially the same from the viewpoint of stably obtaining properties such as removability and adhesiveness.

  In addition, the shape of the above point-like pressure-sensitive adhesive is a projected shape when the surface having the point-like pressure-sensitive adhesive on the substrate is a projection surface, and is a shape seen from the surface side having the point-like pressure-sensitive adhesive on the substrate. is there.

  The type of pressure-sensitive adhesive (pressure-sensitive adhesive) constituting the point-shaped pressure-sensitive adhesive is not particularly limited, and examples thereof include acrylic pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, vinyl alkyl ether-based pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, Examples include polyester-based adhesives, polyether-based adhesives, polyamide-based adhesives, urethane-based adhesives, fluorine-based adhesives, and epoxy-based adhesives. These pressure-sensitive adhesives may be used alone or in combination of two or more.

  Among these, the pressure-sensitive adhesive is preferably an acrylic pressure-sensitive adhesive from the viewpoint of pressure-sensitive adhesiveness, weather resistance, and coating suitability.

  The acrylic pressure-sensitive adhesive is a pressure-sensitive adhesive containing an acrylic polymer composed of an acrylic monomer as an essential monomer component (monomer component) as a base polymer. That is, the pressure-sensitive adhesive contains an acrylic polymer, which is a polymer containing a structural unit derived from an acrylic monomer, as a base polymer.

  The content of the acrylic polymer in the acrylic pressure-sensitive adhesive (100% by weight) is not particularly limited, but is preferably 60% by weight or more (for example, 60 to 100% by weight), more preferably 80% by weight or more (for example, 80 to 100% by weight).

  Moreover, the adhesive which has any form may be sufficient as the said adhesive. The pressure-sensitive adhesive may be, for example, an emulsion-type pressure-sensitive adhesive, a solvent-type (solution-type) pressure-sensitive adhesive, an active energy ray-curable pressure-sensitive adhesive, or a hot-melt-type pressure-sensitive adhesive (hot-melt-type pressure-sensitive adhesive).

  The acrylic pressure-sensitive adhesive varies depending on the forming method and is not particularly limited. For example, a pressure-sensitive adhesive composition containing an acrylic polymer as an essential component (acrylic pressure-sensitive adhesive composition) or a single component constituting the acrylic polymer. It is preferably formed from a pressure-sensitive adhesive composition (acrylic pressure-sensitive adhesive composition) containing a mixture of monomers (monomer) (sometimes referred to as “monomer mixture”) or a partial polymer thereof as an essential component. Although not particularly limited, the former includes, for example, a so-called solvent-type pressure-sensitive adhesive composition, and the latter includes, for example, a so-called active energy ray-curable pressure-sensitive adhesive composition.

  The “monomer mixture” means a mixture composed only of monomer components constituting the polymer. The “partially polymerized product” means a composition in which one or more components among the components of the monomer mixture are partially polymerized.

  The acrylic monomer as an essential monomer component constituting the acrylic polymer preferably includes a (meth) acrylic acid alkyl ester having a linear or branched alkyl group. That is, the acrylic polymer is preferably a polymer composed of (meth) acrylic acid alkyl ester having a linear or branched alkyl group as an essential monomer component. In other words, the acrylic polymer is preferably a polymer including a structural unit derived from a (meth) acrylic acid alkyl ester having a linear or branched alkyl group. As a monomer component which comprises the said acrylic polymer, copolymerizable monomers, such as the following polar group containing monomer and a polyfunctional monomer, may be included. The “(meth) acryl” represents “acryl” and / or “methacryl” (any one or both of “acryl” and “methacryl”), and the same applies to others. Moreover, you may use the said acrylic monomer individually or in combination of 2 or more types. Further, the copolymerizable monomers may be used alone or in combination of two or more.

  Examples of the (meth) acrylic acid alkyl ester having a linear or branched alkyl group (hereinafter sometimes simply referred to as “(meth) acrylic acid alkyl ester”) include, for example, methyl (meth) acrylate , Ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, s-butyl (meth) acrylate, (meth) T-butyl acrylate, pentyl (meth) acrylate, isopentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, Isooctyl (meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, (Meth) acrylic acid decyl, (meth) acrylic acid isodecyl, (meth) acrylic acid undecyl, (meth) acrylic acid dodecyl, (meth) acrylic acid tridecyl, (meth) acrylic acid tetradecyl, (meth) acrylic acid pentadecyl, (meta ) Alkyl (meth) acrylates having 1 to 20 carbon atoms in the alkyl group such as hexadecyl acrylate, heptadecyl (meth) acrylate, octadecyl (meth) acrylate, nonadecyl (meth) acrylate, eicosyl (meth) acrylate Examples include esters. In addition, you may use the said (meth) acrylic-acid alkylester individually or in combination of 2 or more types.

  Among them, the (meth) acrylic acid alkyl ester is preferably a (meth) acrylic acid alkyl ester having 1 to 14 carbon atoms in the alkyl group, more preferably n-butyl acrylate (BA) or 2-ethylhexyl acrylate. (2EHA).

  The content of the (meth) acrylic acid alkyl ester in the total amount (100% by weight) of the monomer component constituting the acrylic polymer is 60% by weight with respect to 100% by weight of the total amount of monomer components constituting the acrylic polymer. The above is preferable, and 80% by weight is more preferable.

  Examples of the polar group-containing monomer include (meth) acrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, isocrotonic acid, and acid anhydrides thereof (for example, acid anhydrides such as maleic anhydride and itaconic anhydride). Carboxyl group-containing monomers such as product-containing monomers; 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate Hydroxyl group-containing monomers such as vinyl alcohol and allyl alcohol; (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N- Butoxymethyl (meth) acrylamide Amide group-containing monomers such as N-hydroxyethyl (meth) acrylamide; Amino group-containing monomers such as aminoethyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, and t-butylaminoethyl (meth) acrylate; Epoxy group-containing monomers such as glycidyl (meth) acrylate and methyl glycidyl (meth) acrylate; Cyano group-containing monomers such as acrylonitrile and methacrylonitrile; N-vinyl-2-pyrrolidone, (meth) acryloylmorpholine, N-vinyl piperidone, Heterocycle-containing vinyl monomers such as N-vinylpiperazine, N-vinylpyrrole and N-vinylimidazole; sulfonic acid group-containing monomers such as sodium vinylsulfonate; phosphoric acid such as 2-hydroxyethylacryloyl phosphate Containing monomers; cyclohexyl maleimide, imide group-containing monomers such as isopropyl maleimide; an isocyanate group-containing monomers such as 2-methacryloyloxyethyl isocyanate. In addition, you may use the said polar group containing monomer individually or in combination of 2 or more types.

  Among them, the polar group-containing monomer is preferably a carboxyl group-containing monomer or a hydroxyl group-containing monomer, more preferably acrylic acid (AA), 2-hydroxyethyl acrylate (HEA), or 4-hydroxybutyl acrylate (4HBA). is there.

  The content of the polar group-containing monomer in the total amount (100% by weight) of the monomer component constituting the acrylic polymer is not particularly limited, but is preferably 1 to 20% by weight from the viewpoint of adhesiveness and removability. More preferably, it is 1 to 15% by weight.

  Examples of the polyfunctional monomer include hexanediol di (meth) acrylate, butanediol di (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, (poly) propylene glycol di (meth) acrylate, Neopentyl glycol di (meth) acrylate, pentaerythritol di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, trimethylolpropane tri (meth) acrylate, tetramethylol methanetri (meth) Examples include acrylate, allyl (meth) acrylate, vinyl (meth) acrylate, divinylbenzene, epoxy acrylate, polyester acrylate, and urethane acrylate. In addition, you may use the said polyfunctional monomer individually or in combination of 2 or more types.

  The content of the polyfunctional monomer in the monomer component total amount (100% by weight) constituting the acrylic polymer is not particularly limited, but is based on the monomer component total amount (100% by weight) constituting the acrylic polymer. 0.01 to 2% by weight, more preferably 0.02 to 1% by weight.

  Furthermore, examples of the copolymerizable monomer include 2-methoxyethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, methoxytriethylene glycol (meth) acrylate, and 3-methoxy (meth) acrylate. (Meth) acrylic acid alkoxyalkyl esters [alkoxyalkyl (meth) acrylate] such as propyl, 3-methacrylic acid (meth) acrylate, 4-methoxybutyl (meth) acrylate, 4-ethoxybutyl (meth) acrylate; Cyclopentyl (meth) acrylate, cyclohexyl (meth) acrylate, isobornyl (meth) acrylate and other (meth) acrylic acid esters and phenyl (meth) acrylate, phenoxyethyl (meth) acrylate, benzyl (meth) A) (Meth) acrylic acid alkyl esters such as (meth) acrylic acid esters having an aromatic hydrocarbon group such as relate, (meth) acrylic acid alkoxyalkyl esters, polar group-containing monomers, ) Acrylic esters; Vinyl esters such as vinyl acetate and vinyl propionate; Aromatic vinyl compounds such as styrene and vinyl toluene; Olefins and dienes such as ethylene, butadiene, isoprene and isobutylene; Vinyl ethers such as vinyl alkyl ether Vinyl chloride and the like can be mentioned. In addition, these copolymerizable monomers may be collectively referred to as “other copolymerizable monomers”.

  Examples of the polymerization method of the acrylic polymer include a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, a polymerization method by active energy ray irradiation (active energy ray polymerization method), and the like. Among these, the solution polymerization method is preferable from the viewpoint of workability and cost. That is, the acrylic polymer is preferably obtained by polymerizing the monomer component by a solution polymerization method.

  In the solution polymerization, various common solvents may be used. Examples of such solvents include esters such as ethyl acetate and n-butyl acetate; aromatic hydrocarbons such as toluene and benzene; aliphatic hydrocarbons such as n-hexane and n-heptane; cyclohexane and methylcyclohexane Organic solvents such as ketones such as methyl ethyl ketone and methyl isobutyl ketone. You may use the said solvent individually or in combination of 2 or more types.

  In the above polymerization, a polymerization initiator such as a photopolymerization initiator or a thermal polymerization initiator may be used. In addition, you may use a polymerization initiator individually or in combination of 2 or more types.

  In the solution polymerization, a thermal polymerization initiator may be used. The thermal polymerization initiator is not particularly limited, and examples thereof include azo initiators, peroxide polymerization initiators (eg, dibenzoyl peroxide, tert-butyl permaleate), redox polymerization initiators, and the like. Can be mentioned. Of these, the azo initiators disclosed in JP-A No. 2002-69411 are particularly preferable. Such an azo-based initiator is preferable because a decomposition product of the initiator hardly remains in the acrylic polymer as a part that causes generation of a heat generation gas (outgas). Examples of the azo initiator include 2,2′-azobisisobutyronitrile (hereinafter sometimes referred to as AIBN) and 2,2′-azobis-2-methylbutyronitrile (hereinafter referred to as AMBN). And 2,2′-azobis (2-methylpropionic acid) dimethyl, 4,4′-azobis-4-cyanovaleric acid and the like. In addition, the usage-amount of a thermal-polymerization initiator is not specifically limited, What is necessary is just the range which can be utilized as a polymerization initiator with which desired molecular weight and reactivity are acquired.

  In the acrylic pressure-sensitive adhesive, the acrylic pressure-sensitive adhesive may contain a crosslinking agent. That is, the acrylic pressure-sensitive adhesive composition for forming the acrylic pressure-sensitive adhesive may contain a crosslinking agent. By using a cross-linking agent, the acrylic polymer that is the base polymer is cross-linked, and the gel fraction of the acrylic pressure-sensitive adhesive can be controlled.

  The crosslinking agent is not particularly limited. For example, an isocyanate crosslinking agent, an epoxy crosslinking agent, a melamine crosslinking agent, a peroxide crosslinking agent, a urea crosslinking agent, a metal alkoxide crosslinking agent, a metal chelate crosslinking agent. Agents, metal salt crosslinking agents, carbodiimide crosslinking agents, oxazoline crosslinking agents, aziridine crosslinking agents, amine crosslinking agents and the like. In addition, you may use the said crosslinking agent individually or in combination of 2 or more types.

  Examples of the isocyanate-based crosslinking agent (polyfunctional isocyanate compound) include lower aliphatic polyisocyanates such as 1,2-ethylene diisocyanate, 1,4-butylene diisocyanate, and 1,6-hexamethylene diisocyanate; cyclopentylene diisocyanate , Cyclocyclohexylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated xylene diisocyanate, and the like; 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate And aromatic polyisocyanates such as xylylene diisocyanate. Examples of the isocyanate-based crosslinking agent include trimethylolpropane / tolylene diisocyanate adduct [manufactured by Nippon Polyurethane Industry Co., Ltd., trade name “Coronate L”], trimethylolpropane / hexamethylene diisocyanate adduct [Japan Polyurethane Industry Co., Ltd. Product name “Coronate HL”], trimethylolpropane / xylylene diisocyanate adduct [Mitsui Chemicals, product name “Takenate 110N”], hexamethylene diisocyanate-based crosslinking agent (HDI-based crosslinking agent) [Asahi Kasei Chemicals Corporation Commercial products such as those manufactured by the company and trade name “Duranate”] can also be used.

  Examples of the epoxy crosslinking agent (polyfunctional epoxy compound) include N, N, N ′, N′-tetraglycidyl-m-xylenediamine, diglycidylaniline, and 1,3-bis (N, N—). Diglycidylaminomethyl) cyclohexane, 1,6-hexanediol diglycidyl ether, neopentyl glycol diglycidyl ether, ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, sorbitol poly Glycidyl ether, glycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitan polyglycidyl ether, Limethylolpropane polyglycidyl ether, adipic acid diglycidyl ester, o-phthalic acid diglycidyl ester, triglycidyl-tris (2-hydroxyethyl) isocyanurate, resorcin diglycidyl ether, bisphenol-S-diglycidyl ether, molecule Examples thereof include an epoxy resin having two or more epoxy groups. As said epoxy type crosslinking agent, commercial items, such as Mitsubishi Gas Chemical Co., Ltd. make and brand name "Tetrad C", can also be used, for example.

  Although content of the said crosslinking agent is not specifically limited, 0.001-10 weight part is preferable with respect to 100 weight part of said acrylic polymers, More preferably, it is 0.01-5 weight part.

  Furthermore, the below-mentioned additive may be contained in the said acrylic adhesive as needed. Such additives include cross-linking accelerators, silane coupling agents, anti-aging agents, fillers, colorants (pigments and dyes, etc.), UV absorbers, antioxidants, chain transfer agents, plasticizers, softeners. And antistatic agents. Furthermore, tackifying components such as acrylic oligomers, rosin derivatives, polyterpene resins, petroleum resins, and oil-soluble phenols are also included. These additives may be used alone or in combination of two or more. In addition, when used in industrial processes such as optical applications, display applications (for example, liquid crystal display applications, plasma display applications, organic EL display applications, etc.), portable electronic device applications, adhesive products require simple transferability. It is preferable that a colorant is added so that the point-like adhesive can be easily confirmed visually.

  The gel fraction of the acrylic pressure-sensitive adhesive is not particularly limited, but is 20 to 80% (% by weight) from the viewpoint of obtaining good removability by balancing the adhesive properties and the cohesive force with a higher balance. Preferably, it is 30 to 70%.

Specifically, the gel fraction (ratio of solvent-insoluble matter) is a value calculated by, for example, the following “method for measuring gel fraction”.
(Measurement method of gel fraction)
Adhesive: About 0.1 g was sampled and wrapped in a porous tetrafluoroethylene sheet (trade name “NTF1122”, manufactured by Nitto Denko Corporation) with an average pore diameter of 0.2 μm, and then tied with a kite string. And the weight is defined as the weight before immersion. In addition, this weight before immersion is a total weight of an adhesive (adhesive extract | collected above), a tetrafluoroethylene sheet, and a kite string. In addition, the total weight of the tetrafluoroethylene sheet and the kite string is also measured, and this weight is defined as the wrapping weight.
Next, a pressure-sensitive adhesive wrapped with a tetrafluoroethylene sheet and bound with a kite string (referred to as “sample”) is placed in a 50 ml container filled with ethyl acetate and allowed to stand at 23 ° C. for 7 days. Then, the sample (after ethyl acetate treatment) is taken out from the container, transferred to an aluminum cup, dried in a dryer at 130 ° C. for 2 hours to remove ethyl acetate, the weight is measured, and the weight is immersed. After weight.
Then, the gel fraction is calculated from the following formula.
Gel fraction (% by weight) = ((A−B) / (C−B)) × 100
(In the above formula, A is the weight after immersion, B is the weight of the bag, and C is the weight before immersion.)

(Base material)
The base material of the pressure-sensitive adhesive product of the present invention plays a role of protecting the point-like pressure-sensitive adhesive and also serves as a support. At least one surface of the substrate exhibits easy releasability (a property of easily peeling) with respect to the point-like pressure-sensitive adhesive. In addition, in the adhesive product of this invention, it is preferable to have a point adhesive on the surface which exhibits easy peelability with respect to the point adhesive of a base material.

  Although it does not specifically limit as said base material, For example, the base material which has a peeling process layer, the low adhesive base material which consists of a fluoropolymer, the low adhesive base material which consists of nonpolar polymers, etc. are mentioned.

  Although it does not specifically limit as a base material in the base material which has the said peeling process layer, A resin base material, a paper-type base material, etc. are mentioned. Examples of the resin base material include polyolefin base materials (polyethylene base materials, polypropylene base materials, etc.), polyester base materials (polyethylene terephthalate base materials, polyethylene naphthalate base materials, polybutylene terephthalate base materials). Etc.), polyamide-based substrates (so-called “nylon” -based substrates), cellulose-based substrates (so-called “cellophane” -based substrates), and the like. Examples of the paper-based substrate include Japanese paper, western paper, high-quality paper, glassine paper, kraft paper, kulpack paper, crepe paper, clay coat paper, top coat paper, and synthetic paper. In addition, such a base material may have any form of a single layer or a laminated body.

  Examples of the release treatment agent (release agent) for forming the release treatment layer of the substrate having the release treatment layer include a silicone release treatment agent, a long-chain alkyl release treatment agent, a fluorine release treatment agent, and a molybdenum sulfide type release agent. Examples include release treatment agents. In addition, such a peeling processing agent may be used individually or in combination of 2 or more types.

  Examples of the fluorine-based polymer in the low-adhesive substrate made of the above-mentioned fluorine polymer include, for example, polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, and tetrafluoroethylene-hexafluoropropylene copolymer. And chlorofluoroethylene-vinylidene fluoride copolymer.

  Furthermore, examples of the nonpolar polymer in the low-adhesive substrate made of the upper nonpolar polymer include olefin resins (for example, polyethylene, polypropylene, etc.).

  The base material is formed by a known or common method. The thickness of the substrate is not particularly limited, but is preferably 4 to 100 μm, more preferably 10 to 50 μm from the viewpoint of workability.

  Although the peeling strength in the said base material is not specifically limited, 0.01-0.30 N / 50mm is preferable, More preferably, it is 0.02-0.20 N / 50mm. When the peel strength is 0.01 N / 50 mm or more, the point-like pressure-sensitive adhesive can be sufficiently retained by the base material, and unintended detachment and deviation of the point-like pressure-sensitive adhesive from the base material can be suppressed, which is preferable. Moreover, when the said peeling strength is 0.30 N / 50mm or less, favorable easy peelability can be obtained and it is preferable. Such peel strength can be adjusted by selecting a material for the base material or selecting a release treatment agent. In addition, the peeling strength of the said base material is the peeling strength with respect to the adhesive surface provided by the 1 or more point-like adhesive in an adhesive product.

  The peel strength of the substrate is determined as follows. An adhesive product (base material / point adhesive structure) is attached to a backing support (for example, a PET film) to obtain a test piece (base material / point adhesive / backing support). Next, the base material is peeled from the test piece under the conditions of a peeling angle: 180 ° and a tensile speed: 300 mm / min with a tensile tester, and the stress at that time is defined as “base peel strength”.

  The pressure-sensitive adhesive product of the present invention is a pressure-sensitive adhesive product (single separator type pressure-sensitive adhesive product, sometimes referred to as “pressure-sensitive adhesive product A”) in which the point-like pressure-sensitive adhesive is protected by a single substrate by winding in a roll shape. In some cases, it is preferable that one surface of the base material is a heavy release surface and the other surface is a light release surface. In addition, the pressure-sensitive adhesive product of the present invention has two or more point-like pressure-sensitive adhesives between two base materials, and the pressure-sensitive adhesive product that protects the point-like pressure-sensitive adhesives with two base materials (double-separator type pressure-sensitive adhesive product, “adhesive” It is preferred that one substrate provides a heavy release surface and the other substrate provides a light release surface. In the present specification, the heavy peel surface of the substrate means a surface having a high peel strength, and the light peel surface of the substrate means a surface having a low peel strength.

  This is because the difference between the peel strengths as described above can effectively suppress the “pile peeling phenomenon” and the “crying phenomenon”. “Peeling and peeling phenomenon” means that when the adhesive product A is rewound, the point-like adhesive moves to the back surface, or one substrate (particularly the substrate on the light release surface side) of the adhesive product B is peeled off. The phenomenon that a part of the point-like pressure-sensitive adhesive remains on the peeled substrate. In addition, the “crying phenomenon” means that when the adhesive product A is rewound or one base material of the adhesive product B is peeled off, the base material does not peel off at a predetermined interface to be peeled off. A phenomenon that peels off at the interface that must adhere to the point-like adhesive.

  In the pressure-sensitive adhesive product of the present invention, the peel strength on the heavy release surface side of the substrate is 0.05 to 0.30 N / 50 mm (preferably 0) from the viewpoint of effectively suppressing the “pile peeling phenomenon” and the “crying phenomenon”. 0.07 to 0.20 N / 50 mm), and the peel strength on the light release surface side of the substrate is preferably 0.01 to 0.15 N / 50 mm (preferably 0.02 to 0.10 N / 50 mm). The peel strength on the heavy peel surface side is greater than the peel strength on the light peel surface side.

(Adhesive products)
The pressure-sensitive adhesive product of the present invention, after providing two or more point-like pressure-sensitive adhesive compositions on a substrate using the pressure-sensitive adhesive composition, cures the point-like pressure-sensitive adhesive composition, It is produced by providing two or more point-like adhesives on at least one surface of the substrate. For example, in the pressure-sensitive adhesive product of FIGS. 1 to 3, two or more point-like pressure-sensitive adhesive compositions are provided on the base material 11b by the pressure-sensitive adhesive composition, and then the point-like pressure-sensitive adhesive composition is cured. After the point-like pressure-sensitive adhesive 12 is formed, the base material 11 a is provided on the point-like pressure-sensitive adhesive 12 so as to protect the point-like pressure-sensitive adhesive 12.

  In addition, when providing two or more dotted | punctate adhesive compositions on a base material with an adhesive composition, you may use a well-known coating method and printing method. Examples of the coating method include a method using a coater such as a gravure roll coater, a reverse roll coater, a kiss roll coater, a dip roll coater, a bar coater, a knife coater, a spray coater, a comma coater, and a direct coater. Examples of the printing method include a gravure printing method, a flexographic printing method, an offset printing method, a relief printing method, and a screen printing method. According to these methods, the area ratio of the pressure-sensitive adhesive product, the size and shape of the point-like pressure-sensitive adhesive, the thickness of the point-like pressure-sensitive adhesive, the interval between the point-like pressure-sensitive adhesives, the distribution mode of the point-like pressure-sensitive adhesive, etc. are easily adjusted. it can.

  Since the pressure-sensitive adhesive product of the present invention has a point-like pressure-sensitive adhesive on the substrate, it exhibits pressure-sensitive adhesiveness to the adherend. Moreover, since it has a point-like adhesive on a base material and an area ratio is in a predetermined range, it is excellent in removability.

  Since the pressure-sensitive adhesive product of the present invention has a point-like pressure-sensitive adhesive instead of a layered pressure-sensitive adhesive on the base material, air is confined between the pressure-sensitive adhesive product and the adherend when being attached to the adherend. It can suppress, and it can suppress that the adhesive product floats, peels off and wrinkles due to bubbles.

  In the pressure-sensitive adhesive product of the present invention, the adhesive strength of the point-like pressure-sensitive adhesive to the base material is weak, and the point-like pressure-sensitive adhesive has pressure-sensitive adhesiveness, so that the transfer property of the point-like pressure-sensitive adhesive is excellent. Therefore, by placing the adherend on the pressure-sensitive adhesive product of the present invention and pressing the adherend, the point-like adhesive is easily peeled off from the substrate, and the point-like adhesive is transferred to the adherend.

  In particular, the pressure-sensitive adhesive product of the present invention regularly has two or more circular point-shaped pressure-sensitive adhesives on the substrate, and the area ratio is 10 to 60%, from the viewpoint of effectively obtaining the above characteristics. It is preferable that the interval between adjacent point-like pressure-sensitive adhesives is 0.5 mm or more and less than 4.0 mm.

Since the pressure-sensitive adhesive product of the present invention has the above properties, it is preferably used for various fixing applications, particularly temporary fixing applications (particularly temporary fixing applications in industrial processes). For example, (i) when combining parts (members) in the production process of the product, the adhesive product of the present invention is pasted on one part, and the point-like adhesive is transferred to the part to obtain a part with the point-like adhesive. The point-like pressure-sensitive adhesive of the part with the point-like pressure-sensitive adhesive can be used for temporary temporary fixing before final strong fixing.
In addition, (ii) in the production process of the product, when the component is incorporated into the housing, the adhesive product of the present invention is attached to the component, the point adhesive is transferred to the component, and the component with the point adhesive is obtained. By using the point-like adhesive of the part with the point-like adhesive, it can be used for temporarily fixing the part to the housing.
Furthermore, (iii) in the inspection process, which is one of the manufacturing processes of the product, when a defective part is found, the part can be reused, but the part can be fixed so that the part can be easily reused. The pressure-sensitive adhesive product of the present invention can be used.
Furthermore, (iv) when the parts are transported in the production process of the product, the adhesive product of the present invention is attached to the parts to transfer the point adhesive, and the parts with the point adhesive are obtained. By using the point-like adhesive of the attached part, the part can be transported by being fixed to a belt conveyor or the like used for transportation. In addition, the temporary fixing application is not limited to the above (i) to (iv).

  More specifically, the pressure-sensitive adhesive product of the present invention includes a transfer step in which the pressure-sensitive adhesive product of the present invention is applied to the first part and the point-like adhesive is transferred, and the first part to which the point-like pressure-sensitive adhesive is transferred. At least one of the first component and the second component from the pasting step of pasting the second component to form a laminate, the inspection step of inspecting the laminate, and the laminate determined to be defective by the inspection step It can use suitably in the method including the peeling process which peels one side. For example, after attaching an electronic component to a housing and performing wiring or the like, the electronic component or the housing can be reused when the inspection process determines that the wiring is defective.

(How to fix parts)
In the present invention, the component fixing method is such that after the point-like adhesive in the above-mentioned pressure-sensitive adhesive product (the pressure-sensitive adhesive product of the present invention) is transferred to the component, the component is attached to an adherend (for example, a casing or other components). It is a method of fixing. The part fixing method of the present invention is a method of fixing the first part to the second part after transferring the point-like adhesive in the adhesive product to the first part. Hereinafter, a specific example of the component fixing method of the present invention will be described with reference to FIG. FIG. 6 is an example of a fixing method using the pressure-sensitive adhesive product of the present invention. In addition, the fixing method of the components of this invention is not limited to the example of FIG.

In FIG. 6, the double separator type adhesive product 1 is used, and includes the following steps (1) to (4).
Step (1) is a step of peeling one base material (base material 11a) from the pressure-sensitive adhesive product 1 and exposing the point-like pressure-sensitive adhesive 12. In addition, from the point which exposes the point adhesive 12 easily, it is preferable that the peeling surface of the base material 11a is a light peeling surface, and the peeling surface of the base material 11b is a heavy peeling surface.
Step (2) is a step of positioning the first component 2 on the exposed point-like adhesive 12 and transferring the point-like adhesive 12 to the first component 2. In the step (2) of the present embodiment, the first component 2 is pressed against the point-like adhesive 12, and the first component 2 is applied with a force N against the point-like adhesive 12, and the point-like adhesive is applied. The agent 12 is transferred to the first part 2. In FIG. 6, the force N is applied from the first component 2 side, but even when the force N is applied from the base material 11 b side, the point-like adhesive 12 is similarly transferred to the first component 2. .
Step (3) is a step of peeling the substrate 11b from the structure obtained in step (2). By the step (3), a first part 2 (part with a point adhesive) having a point adhesive is obtained.
Step (4) is a step of fixing the first part 2 having a point-like adhesive obtained in step (3) to the second part 3 with the point-like adhesive 12. Thereby, the first component 2 is fixed to the second component 3 via the point-like adhesive 12.

  According to the fixing method of the present invention, since the above-mentioned adhesive product is used, the component can be easily fixed at a desired position. Further, after the fixing method, the fixing may be performed more firmly with an adhesive having higher adhesive strength or other fixing means. That is, in this case, the component is temporarily fixed to the adherend by the fixing method, and then the temporarily fixed component is permanently fixed to the adherend.

  EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated more concretely, this invention is not limited at all by these.

Examples and Comparative Examples 25 μm-thick PET film (hereinafter, referred to as “heavy release PET film”) obtained by subjecting a solvent-type acrylic pressure-sensitive adhesive composition to heavy release treatment with a silicone release agent on one side by gravure printing. A point-like pressure-sensitive adhesive was formed on one surface of the PET film. Next, in order to protect the point-like pressure-sensitive adhesive, a 25 μm-thick PET film (hereinafter sometimes referred to as “lightly-released PET film”) that has been subjected to a light-release treatment with a silicone-based release agent on one side is bonded. It was. And it wound in roll shape and was set as the adhesive product.
The printing mold used was a printing mold that was regularly distributed with point-like adhesives and adjusted so that regular circular point-like adhesives were provided. For each example and comparative example, It adjusted so that the magnitude | size of the point adhesive shown by 1, the thickness of a point adhesive, the space | interval and area ratio between point adhesives may be obtained.
In addition, in the pressure-sensitive adhesive products of Examples and Comparative Examples, the circular point-shaped pressure-sensitive adhesive is regularly distributed on the base material, and the size, thickness, and shape of the circular point-shaped pressure-sensitive adhesive are unified. Furthermore, the interval between adjacent point-like adhesives is also unified.

(Evaluation)
About the Example and the comparative example, the following measurement or evaluation was performed. The results are shown in Table 1.

(Measurement of adhesive strength)
The light release PET film was peeled from the adhesive product. A 25 μm-thick PET film (trade name “Lumirror S10”, manufactured by Toray Industries, Inc.) was attached to the exposed surface of the pressure-sensitive adhesive product, and a pressure-sensitive adhesive product lined with the PET film was obtained. Next, the adhesive product lined with the PET film was cut into a width of 25 mm to obtain a test piece (width: 25 mm, length: 100 mm).
After peeling off the heavy release treated PET film from the test piece and exposing the surface with a point-like adhesive, the test piece was bonded to a SUS plate (stainless steel plate) and pressure-bonded under conditions of 2 kg roller and 1 reciprocation, It was left for 30 minutes in an environment of 23 ° C. After leaving, the test piece was peeled from the SUS plate using a tensile tester (device name “Autograph”, manufactured by Shimadzu Corporation) under the conditions of a peeling angle of 180 ° and a peeling speed of 300 mm / min. The thickness (N / 20 mm) was measured and used as the adhesive strength.

(Measurement of peeling time by constant load peeling test)
The light release PET film was peeled from the adhesive product. A PET film (trade name “Lumirror S10”, manufactured by Toray Industries, Inc.) was attached to the exposed surface of the pressure-sensitive adhesive product, and a pressure-sensitive adhesive product lined with the PET film was obtained. Next, the pressure-sensitive adhesive product lined with a PET film was cut into a width of 20 mm to obtain a test piece (width: 20 mm, length: 150 mm).
The heavy release treated PET film was peeled from the test piece, and the surface with the point-like adhesive was exposed. The test piece with the surface exposed to the point-like adhesive was bonded to one side of a polycarbonate plate (manufactured by Mitsubishi Gas Chemical Co., Ltd.) so that the point-like adhesive and the polycarbonate plate were in contact with each other under the condition of one reciprocation of the 2 kg roller. Crimped and left for 16 hours. After standing for 16 hours, a 50 gf load was applied to the end of the test piece in the direction perpendicular to the surface of the polycarbonate plate, peeling of the test piece was started, and the elapsed time was measured when the test piece was peeled 100 mm in the length direction. And peeling time.

(Evaluation of removability)
The light release PET film was peeled from the adhesive product. Adhere the SUS plate to the exposed surface of the adhesive with the point-like adhesive, and transfer the point-like adhesive by pressure bonding under the conditions of 2 kg roller and 1 reciprocation. A test piece having one or more point-like adhesives on one surface was obtained.
The heavy release treated PET film was peeled from the test piece, and the surface with the point-like adhesive was exposed. An adhesive tape (trade name “Damplon S NO. 3653”, manufactured by Nitto Denko CS System Co., Ltd.) was brought into contact with and peeled from the exposed spot-like adhesive of the test piece.
As a result, the case where the point-like adhesive can be easily removed from the SUS plate is defined as “good” (◯), and the case where the point-like adhesive cannot be removed from the SUS plate even after repeated contact and peeling is indicated as “bad” (× ).

  In the pressure-sensitive adhesive product of Example 3, the peel strength on the heavy peel surface side was 0.110 N / 50 mm, while the peel strength on the light peel surface side was 0.053 N / 50 mm.

DESCRIPTION OF SYMBOLS 1 Adhesive product 11a Base material 11b Base material 12 Point-like adhesive 121 Center A Size of point-like adhesive B Distance (distance) between point-like adhesives
2 First part 3 Second part N force 51 Polycarbonate plate 52 Test piece 53 Weight

Claims (3)

A pressure-sensitive adhesive product having two or more point-like pressure-sensitive adhesives on a substrate and having an area ratio defined below of 10 to 60%.
Area ratio (%): Ratio of the area occupied by the point-like adhesive in the unit area of the substrate   The pressure-sensitive adhesive product according to claim 1, wherein an interval between adjacent point-like pressure-sensitive adhesives is 0.5 mm or more and less than 4.0 mm.   A method for fixing a part, comprising: transferring the pointed adhesive in the pressure-sensitive adhesive product according to claim 1 or 2 to the first part, and then fixing the first part to the second part.

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